Thread: Spaces in posix paths

  1. #1
    Registered User
    Join Date
    Mar 2009

    Spaces in posix paths

    How do you deal with spaces when making a valid posix path? I'm using a library that converts spaces to %20, but using %20 doesn't seem to work with any standard posix functions that deals with files.

    The library is Apple's CoreFoundation, and the function that returns the posix path with spaces encoded as %20 is CFStringGetFileSystemRepresentation.

  2. #2
    spurious conceit MK27's Avatar
    Join Date
    Jul 2008
    segmentation fault
    POSIX filenames can contain spaces. In fact, a posix filename can contain any character except / and NULL. However, you will probably not see them with *, etc, because there are some characters the shell makes impossible.

    %20 plain and simple is for use in http query strings. It has nothing to do with POSIX -- perhaps the library is presuming that this is for network transmission?

    It's probably not uncommon to set more strict rules tho, eg:
    Quote Originally Posted by University of Albany
    Filenames on Our UNIX System
    Special characters that should not be used in filenames: — & ; * ? ' " ` [ | ] ( ) $ < > { } ^ # / \ % ! ~ and the SPACE character
    Should not is not cannot, ie, this has nothing to do with "the standard".

    You might as well just replace spaces with underscores to be safe. I despise spaces in filenames because they can be a pain and require extra quoting in scripts, on the command-line, etc.
    Last edited by MK27; 12-11-2009 at 07:29 AM.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  3. #3
    Registered User
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    Mar 2009
    Either way, I fixed it by replacing CFURLCopyPath with CFURLCopyFileSystemPath. So it wasn't CFStringGetFileSystemRepresentation that was doing something strange after all ...

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